{"uid":"cap_OIHJUCithCRkxSaXUhvZ2","slug":"quantaflow-x402-api-gateway-alchemy-stable-testnet-b7399379","name":"QuantaFlow x402 API Gateway – Alchemy Stable Testnet","description":"Every request, a quantum of value. x402 protocol-based payment endpoint for web3/DeFi tools.","url":"https://quanta-roan.vercel.app/api/service/alchemy-stable-testnet?utm_source=zero.xyz","method":"POST","headers":{},"bodySchema":{"type":"object","properties":{"body":{"type":"string","description":"Optional JSON body forwarded to POST requests."},"path":{"type":"string","description":"Path below the selected upstream origin."},"query":{"type":"object"},"method":{"enum":["GET","POST"],"type":"string"}}},"responseSchema":{"description":"The upstream response body and content type are passed through after successful payment."},"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.01","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.01/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.01","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_-TTl68bxyTOYcGKKkHaGO","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.01","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Proxies requests to Alchemy's stable testnet APIs via an x402 micropayment-gated gateway, forwarding arbitrary paths, query params, and request bodies to the upstream Alchemy service.","exampleAgentPrompt":"Call the Alchemy stable testnet API at path '/v2/eth_getBalance' with query param 'address=0xABC123' — route it through QuantaFlow and pay the $0.01 USDC x402 fee automatically.","exampleUseCases":[{"title":"Check testnet wallet balance","prompt":"Get the ETH balance for wallet address 0xABC123 on the Alchemy stable testnet — use QuantaFlow to pay the per-call fee and give me the result."},{"title":"Fetch testnet NFT ownership data","prompt":"Query the Alchemy stable testnet for all NFTs owned by address 0xDEF456 using the getNFTs path — route it through QuantaFlow and pay the micropayment fee."},{"title":"Simulate testnet smart contract call","prompt":"Forward a POST to Alchemy stable testnet at path '/v2/eth_call' with body '{\"to\":\"0xContract\",\"data\":\"0xcalldata\"}' via QuantaFlow and return whatever the upstream responds with."}],"resultDescription":"The raw upstream Alchemy stable testnet API response body is passed through as-is, along with the original content type. The agent receives whatever JSON or data the Alchemy endpoint returns after the x402 payment is verified and the request is forwarded.","failureModes":["Payment verification failure if insufficient USDC balance or invalid x402 header — gateway returns 402 Payment Required","Invalid or unsupported path results in upstream 404 from Alchemy","Malformed JSON body causes upstream 400 Bad Request passed through","Alchemy rate limits or API key exhaustion may return 429 upstream","Testnet instability or Alchemy downtime results in 502/503 passthrough errors","Missing required 'path' parameter results in gateway-level error"],"whenToPreferThis":"Choose this endpoint when you need pay-per-call access to Alchemy's stable testnet APIs without committing to a subscription plan, or when operating in a web3/DeFi agent context where x402 micropayments are the preferred payment mechanism. Ideal for low-frequency or automated testnet queries where per-request USDC billing is more efficient than a monthly API key.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-10-18T06:46:51.330Z","isFirstParty":false,"canonicalSlug":"quantaflow-x402-api-gateway-alchemy-stable-testnet-b7399379"}